Improvement in packing pump-joints



B. PITTS. PACKING PUMP JGINTS.

Na: 653805K Patnted Jan. 18,1867.

'WE mums-#maks co, mom-urna. WASHINGTON. D, c:v

@uiten giants @anni @frn BENAIAH FITTSY, 0F NEWARK, NEW JERSEY.

Marsman No. 65,803, and .new 18, 1867.

IMPROVEMENT IN PACKING PUMP-JOINTS.

TO ALL WHOM- IT MAY CONCERN:

Be vit known that I, BENAIAH FITTS, of Newark, county of Essex, State of New Jersey, have invented a new and useful Improvement in Packing of Joints forv Pumps and other purposes; and I do hereby declare that the following is a full, clear, and exact description ofl the construction and operation of the same, reference being had to the annexed drawing making a part of this specification. i

The invention relates to improvements in packing the joints betwixt metal surfaces by the use of India rubber or other similar substance; the rubber being first prepared and placed upon the surface of the metal, or in grooves or rccessesvmade for the purpose, in a plastic state, and then pressed down to the desired thickness and vulcanized The drawings are designedto represent a pump, with its joints packed, as herein described.

Figure 1 is au elevation of the pump.

Figure 2 is a section, through s s, fig. 1, showing thc packing betwixt the joints, also a valve and valveseut, with their rubber packings.

Figure 3 is to show the face of a valve with its rubber packing or facing.

Figure 4.- is a. section through :z: su, iig. 3-

lThe same letters referring to like parts in all.

The construction is as follows: a is a force-pump eylindf'zr,- made. of `iron or other metal in the usual form. fr is a cap, placed over the. valves, forming the valve-box, and ,has to be removed to get access to the valves. c c isa. valve-scat made of brass or other metal, and is held in its place by cap b resting upon it, as shown. ff are screws that hold the cap b and valve-seat e c in place. d d are packings, betwixt valve-seat c c and cylinder a. e e are paclsiugs betwixt cap b and cylinder a. These packings are of India rubber, and formed in a peculiar manner, hereafter described. Figs. 3 'and 4 is a valve. It is also shown atp, fig. 2, and is made by forming a metallic case, upd filling it with India rubber in a plastic state, and then vulcanizing in o, being the metallic case, and z' the rubber.

The operation of packing the vpump is as follows: No care need be taken to truc off or straighten the surfaces under the packings e c and ff, but they should be clean and freefrorn oil or dust,I so that the rubber will adhere iirmly to the metal. The rubber is then mixed and prepared as for packing, and, while in the plastic state, laid on to the cylinder in sufficient quantity to ill up ull the inequality of the surfaces and form a packing. Thesurface of the rubber is then covered over p'ith-a coating of iinely pulrerized soapstone, so as to prevent it adhering to thejvalve-seat c c or cap b. The valve-seat is then put on, and then the cap, and drawn down .to thc desired position by screws ff; the cap drawing down and holding in place the valve-seat, and all rubber that is not required to form the packing and make the joint is'forc'ed out. The pump is then placed in an oven or otherwise heated to the required temperature, and there remains until the rubber has become vulcanized- It will then be seen on removing the cap and valve-seat that the rubber has firmly adhered t0 the pump-cylinder, while the cap and valve-seat can be taken off or put on at pleasure, and all the inequalities of the metal are iillcd up with rubber, insuring a tight joint, and as the rubber cannot be moved in its position or taken off, (however often it may be necessary to take oif the cap or valve-sean) the packing remains the same, and always securing a tight joint. The valve, figs. 3 and 4, is constructed in a similar manner, a metallic case, o, being formed with its hinge or guide, with the outside edge corresponding with the outside of the valve-seat. Groves'oi recesses are formed over the-valve-seat in the metallic case o, as shown. The grooves are then filled with rubber in the plast-ic state, pressed down with a die having a concave face, and vulcanized. 'lhe rubber thus becomes iirinly attached to the metallic case, forming au elastic convex surface to como in contact with the valve-scat, as shown at or, if desired, a fiat die may be used, thus leaving a flat surface.

I do not claim broadly vulcanizing rubber upon the surface of u' metal, for this is done in coating pipes and'other manufactured articles. Neither do I claim vulcanizing rubber between plates or forms of metal, for this isa well-known process in moulding. But what I claim as new, and desire to secure by Letters Patent, is-

1. The packing composed of India rubber or other similar substance, formed or constructed substantially as set forth and described; that is to say, a packing made by'applying the prepared India rubber in the plastic state to the diicrcnt surfaces, as shown, and compressing it to {it all the inequalities, recesses, or grooves in the metal, and being made, in vulcanizing, to adhere firmlyto one part of the metal, leaving the other to be freely removed.

2. I claim a pump-valve, metal, by being vulcanized therein, a'n

composed of a metallic case, in which is confined India rubber adhering to thp d forming au elastic face, as described.

`BliNAIAi-I FI'ITS.

Witnesses J. E.- Huunsrnv, C. HALSEY CANFIELD 

